Subtraction

In a chemical reaction, the mass of the reactants is 50 grams, and the mass of the products is 45 grams. What is the mass lost during the reaction?

• 5 grams

• 10 grams

• 15 grams

• 0 grams

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A scientist measures the initial temperature of a substance as 100°C and the final temperature as 80°C. What is the change in temperature?

• 20°C

• 10°C

• 30°C

• 40°C

If a car travels 150 km and then travels back 50 km, what is the total distance subtracted from the initial journey?

• 50 km

• 100 km

• 150 km

• 200 km

In a physics experiment, the initial velocity of an object is 20 m/s, and the final velocity is 5 m/s. What is the change in velocity?

• 15 m/s

• 25 m/s

• 10 m/s

• 5 m/s

A container has 500 ml of water. After evaporation, 150 ml is left. How much water has evaporated?

• 350 ml

• 150 ml

• 250 ml

• 400 ml

A scientist has a solution with a concentration of 10 M. After dilution, the concentration is 7 M. What is the change in concentration?

• 3 M

• 5 M

• 2 M

• 4 M

In an experiment, the initial mass of a sample is 200 grams, and the final mass is 180 grams. What is the mass loss?

• 20 grams

• 10 grams

• 30 grams

• 40 grams

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A biologist counts 120 cells in a sample. After treatment, 30 cells die. How many cells are left?

• 90 cells

• 100 cells

• 80 cells

• 70 cells

A physics student measures the initial energy of a system as 500 J and the final energy as 450 J. What is the energy loss?

• 50 J

• 100 J

• 150 J

• 200 J

Tags

NGSS.MS-PS3-5

A chemical reaction starts with 60 moles of reactants and ends with 45 moles of products. How many moles were lost?

• 15 moles

• 10 moles

• 5 moles

• 20 moles

Tags

NGSS.MS-PS1-5